Signal processing for digital communications

In this field of research, the team builts studies upon its historic skills of more than 20 years in signal processing applied to communicating systems. The research interests are in the optimization of the physical layer of these systems through for instance the search for new electronic devices and innovative waveforms, processing algorithms with controlled complexity and original resource sharing strategies. The main motivation is to tackle the challenges emerging from the changes in the usage and the evolutions of the communication infrastructures.

Signal processing for telecommunications

Within this theme, we seek to make the most of the degrees of freedom available in a communications system, such as the properties of the source signals (optimization of waveforms), the temporal and frequency diversities of the propagation channels, the diversity of situation in multi-user scenario, or even polarization and diversity of antennas for MIMO systems. The work focuses both on the proposal of new communication strategies and signal processing algorithms and on the theoretical evaluation of their performance.

Important studies are being carried out in particular on the spatialization of transmissions thanks to radio architectures with a large number of antennas (massive MIMO), or on the search for index modulation formats to accompany the rise in frequency of systems towards millimeter waves.

Activités MIMO

Radio architectures and physical layer

In this second part, the research carried out is characterized by a strong support on the knowledge and the design of electronic devices and architectures implemented for the establishment of communications, radio or wire. Two major areas of study fall within this component, on the one hand according to the criterion of reducing energy consumption for traditional wireless communication systems, and on the other hand following the criterion of increasing the capacity for electronic devices not originally intended for high speed information transmission.

By way of example, we can cite the development of industrial power buses (power PLC) or the optimization of visible light communications (VLC).

Gate driver de puissance communicant
Expérimentations de liaison par fibre optique plastique

Cross-layer, heterogeneous networks, interconnections

In this track of research, the team is interested in the development and analysis of new communication models reflecting trends in infrastructure and network typologies. Two major aspects that tend to be essential for future communication systems are in particular strongly studied: the shortening of information flows and their sporadic transmission on the one hand, and changes of scale with the exponential increase in connections. between heterogeneous entities (terminals of all types) on the other hand. The strength of the team to tackle this type of problem is based on its strong expertise in the physical layer of systems with regard to the work of the two previous themes, used in the development of fine models of communication at the scale of a global network.

In particular, the team is interested in the search for theoretical performance bounds in the context of networks of connected objects based on short packet communications. In addition, a number of studies use stochastic geometry as a central tool, thus making it possible to deal with the case of large-scale networks, potentially made up of network components of different natures.

Activités Réseaux